Fix blurry content after disabling dev tools emulation

third_party/WebKit/public/platform/WebLayerTreeView.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 140 matching lines @@
       const WebLayer* outerViewportScrollLayer) {}
   virtual void clearViewportLayers() {}
 
   // Used to update the active selection bounds.
   virtual void registerSelection(const WebSelection&) {}
   virtual void clearSelection() {}
 
   // Mutations are plumbed back to the layer tree via the mutator client.
   virtual void setMutatorClient(std::unique_ptr<WebCompositorMutatorClient>) {}
 
+  // For when the embedder itself change scales on the page (e.g. devtools)
+  // and wants all of the content at the new scale to be crisp.
+  virtual void forceRecalculateRasterScales() {}
+
   // Input properties ---------------------------------------------------
   virtual void setEventListenerProperties(WebEventListenerClass,
                                           WebEventListenerProperties){};
   virtual void setHaveScrollEventHandlers(bool){};
 
   // Debugging / dangerous ---------------------------------------------
 
   virtual WebEventListenerProperties eventListenerProperties(
       WebEventListenerClass) const {
     return WebEventListenerProperties::Nothing;
@@ skipping 11 matching lines @@
   // Toggles the debug borders on layers
   virtual void setShowDebugBorders(bool) {}
 
   // Toggles scroll bottleneck rects on the HUD layer
   virtual void setShowScrollBottleneckRects(bool) {}
 };
 
 }  // namespace blink
 
 #endif  // WebLayerTreeView_h